Develop and parameterize applications for secondary engineering components and systems, taking into account relevant IT and OT security requirements for critical infrastructure Integrate and connect external control centers, installations, and devices into our integration environments Carry out functional tests, factory acceptance tests (FATs), and technical coordination activities together with our customers Commission secondary engineering systems at customer sites across Germany and handle internal and external service cases Provide technical support to our customers and actively contribute to the development and enhancement of concepts and requirements in the field of substation control systems Support the continuous improvement of internal processes, standards, and regulations with the goal of further enhancing the quality and efficiency of testing and commissioning activities Create, maintain, and update the associated technical documentation Work closely with project management, systems engineering, and other specialist departments to ensure successful project execution and a high level of customer satisfaction